Major Description
KYLIN-1557 will add check on the aggregation group combinations; If an agg group's combination number exceeds a threshold, it will report error. So the cube desc generated by JS should better be good by default; A simple implementation would be: if user selects <= 12 dimensions, it is okay to put them all in one group's "include" field; If > 12, keep 11 in the "include" field, and move all left to the "joint" list;